nRF9160 Low Power Example

[GNotman]

Hi,

I'm currently trying to evaluate the nRF9160 for one of our projects.

One key requirement is the power consumption when using eDRX.

I have tried profiling the at_client sample, but the lowest I've manged with the nRF9160DK is about 900uAs.

Additionally, the power profile does not seem to show the expected paging windows when eDRX is configured.

Is there any low power example, or documentation which can help me with this?

[isurki]

hi Håkon,

Thanks for the response. We need to shut down almost everything from the board for 15 minutes, then read an analog input, and look for any mesages in the modem.

How can I turn off the modem so I can get a lower current measurement? The current consumption has to be as low as possible during those 15 minutes I talked about, since the system is supposed to be powered by batteries.

Kind regards,

Ainara

[Håkon Alseth]

Hi Ainara,

 

Could you try this with the latest modem fw (mfw_nrf9160_0.7.0-29.alpha)?

It should allow the eSIM to be turned off during PSM, allowing you to go to the lowest power mode, which will be approx. 7 uA (on engineering silicon) if the application does not start any peripherals requiring the HFCLK. 

isurki said:

We need to shut down almost everything from the board for 15 minutes, then read an analog input, and look for any mesages in the modem.

If you have questions/issues implementing your specific use-case, I'd recommend that you create a new case with the specific details.

 

Kind regards,

Håkon

[isurki]

Hi Håkon,

I tried with the latest modem fw, and the latest release (v 0.4.0) And I get the same current value. I can't get lower than 20uA (it fluctuates between 20uA and 30uA).

I'm just starting with the DK, and maybe this question has an ovbious answer, but it is possible to comunicate with the modem even with the uart disabled? We need to be able to open a comunication socket with the modem every certain time to ge some data.

I'll open another case to ask for help with my specific use-case.

Kind regards,

Ainara

[GNotman]

Hi Hakon,

I'm still stuck here with the original problem.

The best I have been able to achieve is about ~80uAs. That is with just SPM which goes straight to idle/sleep (before configuring or jumping).

I've tried this with two separate DKs both 0.8.2 using the latest 0.7.29-alpha firmware and with the SB44 mod.

[Håkon Alseth]

Hi,

 

GNotman said:

I'm still stuck here with the original problem.

The best I have been able to achieve is about ~80uAs. That is with just SPM which goes straight to idle/sleep (before configuring or jumping).

I've tried this with two separate DKs both 0.8.2 using the latest 0.7.29-alpha firmware and with the SB44 mod.

Could you share your project so I can try to recreate it at my end?

 

Kind regards,

Håkon